Ios 从UIButton视图中删除“活动指示器”子视图

我用几个按钮构建了一个界面。这些按钮从互联网上获取标题信息。我向视图中的每个按钮添加UIActivityIndicator，如下所示：

- (void) addActivityIndicator {
    UIButton * button;

    for (int i = 1; i <= 10; i++){
        button = (UIButton *)[self viewWithTag:i];
        NSLog(@"Button: %i",i);
        [button setTitle:@"" forState:UIControlStateNormal];
        button.enabled = NO;

         UIActivityIndicatorView * buttonSpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        [buttonSpinner startAnimating];
        buttonSpinner.tag = i;
        buttonSpinner.frame = button.bounds;
        [button addSubview:buttonSpinner];
    }

}

---

有什么想法吗？

也许您可以尝试迭代子视图并将其删除

    for (int i = 1; i <= 10; i++){
        button = (UIButton *)[self viewWithTag:i];
        NSLog(@"Button: %i",i);
        [button setTitle:@"" forState:UIControlStateNormal];
        button.enabled = NO;

         UIActivityIndicatorView * buttonSpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        [buttonSpinner startAnimating];
        buttonSpinner.tag = i*99;
        buttonSpinner.frame = button.bounds;
        [button addSubview:buttonSpinner];
    }

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

UIActivityIndicatorView *toRemove;
for (UIView *view in button.subviews)
{
    if ([view isKindOfClass:[UIActivityIndicatorView class]])
    {
        toRemove = (UIActivityIndicatorView *)view;
        break;
    }
}
[toRemove removeFromSuperview];

---

也许您可以尝试遍历子视图并删除它

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

UIActivityIndicatorView *toRemove;
for (UIView *view in button.subviews)
{
    if ([view isKindOfClass:[UIActivityIndicatorView class]])
    {
        toRemove = (UIActivityIndicatorView *)view;
        break;
    }
}
[toRemove removeFromSuperview];

---

是的，我以前试过，但得到错误

[UIButton stop animating]：无法识别的选择器发送到实例

是。我认为存在的问题是按钮标签和指示器标签是相同的。我不这么认为，因为它们是相同的。您是否成功更改了按钮的标题？我发现，如果UIButtons的标记和UIActivityIndicatorView的标记相同，则您的方法将失败。但是，如果更改指示器视图的标记（示例标记*99），则您的方法工作正常。@@@！。无论如何，问题已经解决了。太奇怪了。是的，我以前试过，但得到错误

[UIButton stop animating]：无法识别的选择器发送到实例

是。我认为存在的问题是按钮标签和指示器标签是相同的。我不这么认为，因为它们是相同的。您是否成功更改了按钮的标题？我发现，如果UIButtons的标记和UIActivityIndicatorView的标记相同，则您的方法将失败。但是，如果更改指示器视图的标记（示例标记*99），则您的方法工作正常。@@@！。无论如何，问题已经解决了。真奇怪。

UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

UIActivityIndicatorView *toRemove;
for (UIView *view in button.subviews)
{
    if ([view isKindOfClass:[UIActivityIndicatorView class]])
    {
        toRemove = (UIActivityIndicatorView *)view;
        break;
    }
}
[toRemove removeFromSuperview];